ToolsVortex Guides
Quick answers to everyday math
Clear, sourced guides on pay, health, home projects and pets. Each one comes with a chart, worked examples and a free calculator.
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How Much Paint Do I Need? Room-by-Room Chart and Formula
A gallon of paint covers 350 to 400 sq ft. Use the simple formula and room-size chart to buy exactly…
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Dog Years to Human Years: The Real Formula (It’s Not ×7)
The 7-to-1 rule is a myth. A dog’s first year equals about 15 human years. See the chart by size,…
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Hourly to Salary: How Much Is Your Hourly Wage Per Year? (Chart)
Multiply your hourly wage by 2,080 to get your yearly salary. See the full chart, monthly and biweekly pay, overtime,…
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How Many Steps in a Mile? Chart by Height for Walking and Running
Most adults take 2,000 to 2,500 steps to walk a mile. Here is a chart by height, the exact formula,…